Fuel-supply system



Feb. 1Q, 1931. y L, P. BARLOW FUEL SUPPLY SYSTEM Filed Aug. 2o, 192e 2sheets-sheet 1 il :Edna-1 .LEE/@I4 Feb. 1o, 1931.

L. P. BARLOW `FUEL SUPPLY SYSTEM 2 sheets-sheet 2 Filed Aug. 20, 1928gru/vento@ ewa- Parfws Patented Feb. 10, 41931 LESTER. P. BARDOW, 0FDETROIT, vIIIGIEIIG'AIN' FUEL-SUPPLY sYs'rEm Application led August'20,1928. Serial No. 300,712. f

My invention relates to fuel supply systems for internal combustionengines and has for its object to provide means by -Which the fu-el maybe supplied in suiicient quantity in starting a cold engine to ensurethe priming necessary to form in the'engine .cylinder an explosivecharge.

combustion engine is usually supplied to the carbureter from a oatbowlin which a hollowkmetal or cork .float is arranged to conf troladmission of liquid` that thevliquid.- will not be above a predeterminedlevel, the Iioat bowl being provided in its upper portion with an openair vent through which air may pass A freely into or from theioat bowlso that the pressure withinv the float bowl will not vary fromatmospheric.- The fuel is usually supplied to the'float bowl from a fueltank so located that it will flow by Y,gravity to the float bowl. A l

Admission of air to the carbureter is usually through a valve controlledinlet opening.

When a cold engine is to be started thel engine is turned over by anelectric or other .starter or by a hand crank so that the movement ofthe pistons in the cylinders will draw in an explosive mixture from thecarbureter.

In order that the. explosive mixture may not be too lean it is usual toclose the valve controlling the air inlet. But even with the air inletclosed it is a matter of diiiiculty to start a .cold engine and specialpriming is often necessary. I

Supplying fuel to the float bowl by gravity necessitates locating thevfuel tank at an elevation above the ioat bowl and in an automobile therelative level of the float bowl and fuel tank may vary greatly as theautomobileI fgoes .up or down hills. In order to maintain fuel toI thefloat bowl may bein'suicient for the necessary priming, particularly ifthere gine when -a power feed for the uel is used The gasoline or otherfuel for an` internal though the invention is adapted for-.use alsowhere gravity feed is used.

With the object above indicated and other objects hereinafterexpl'ainedin view my invention consists in the construction and comtodeliver the gasolene to a mixing tube 3 to the lower end of which air isadmitted from air inlet 4 controlled by choke valve 5. 6 indicates thefuel supply pipe leading from float bowl 7 to nozzle 2. 8 indicates the`float in the float bowl carrying needle valve 9 which controls inletopening .10 from pipe 11` which leads from fuel tank 12. 13indicates'apump in pipe 11 for supplying liquid fuel from tank 12 tofloat bowl,

andthrough pipe 6 to the carbureter.

Choke valve 5 in air inlet 4 is pivoted on shaft 15 on which is securedarm 16 extending above and below the shaft. To the upper portion of arm16 is secured a pull cord 17 for swinging the valve to open positioh andspring 18 forV swinging it to closed position.

The lowerportion of arm 16 is adapted at itsy 'lower end to carryadjustable pin 19, the inner lend of which bears against the end of rod20 which is longitudinally slidable'in guides 2l and 22. Spring 23coiled about rod l20 bears at one end against guide 23 and .at

the other end against ring 24. held by pin 25. A stop pin 30 carried byrod 20 acting against `varies so as to maintain atmospheric pressuretherein under ordinary conditions. At the inner end of the vent openingvalve seat 27 is provided and slidable rod 20 carries at its end valve28 adapted to fit valve seat 27 to close the vent opening against escapeof air from the float bowl.

When the engine is to be started choke valve 5 is Closed byxmeans ofcord 17 and as the` upper end of arm 16 is swung to the left asindicated in Figure 1 the end of adjustable pin 19 carried by weight 18strikes the outer end of rod 20 sliding the rod to the right and forcingvalve 28 on its end against valverl seat 27 closing vent opening 26. Asthe engine is turned over by the starter, or by the hand crank, thepump, which is driven from the engine shaft, forces fuel into the floatbowl and, as the vent 26 is closed, forces the fuel to the carbureterand through it to the engine cylinders, thussupplying fuel necessary forpriming.

The turning over of the engine causes the contents of the carbureter tobe drawninto the cylinders tending to create a vacuum, the choke valvebeing closed against entrance of air through air inlet 4. If the airvent 26 is open air will enter through it to relieve the vacuum and,while liquid contained in the float chamber will be drawn into thecarbureter, the liquid fuel so suppliedimay not be suicient to supplysuiicient fuel for priming. By closing air vent 26 against entrance ofair the suctionof the engine cylinders will be effective to draw liquidfuel through pipe 11 from fuel tank 12, thus providing the fuelnecessary for priming the pump, the suction due to the movement of thepiston in the engine cylinder being thus effective through the floatchamber, the portion of pipe 11 leading from the engine, the engine, andthe portion of pipe 11 leading from the fuel tank to the pump, thuspriming the pump.

Having thus described my invention whfat I claim is:-

1. In a fuel supply system for an internal combustion engine comprisinga carbureter having an air inlet and a fuel inlet, a float bowl forsupplying fuel to the fuel inlet of the carbureter havingA a normallyopen air vent therein and otherwise closed against inlet of air,positively operating means for supplying fuel to the fuel bowl, meansfor closing the air inlet ofthe carbureter and means for closing the airvent 0f the float bowl, simultaneously with the closing of the air inletof the carbureter arranged to leave the air vent fully open until theair inlet a of the carbureter is fully closed.

2. In a fuel supply system for an. internal combustion engine comprisinga carbureter havin an air inlet and a fuel inlet, a float bowl orsupplying fuel to the fuel inlet of the carbureter having a normallyopen air vent therein and otherwise closed against inlet of air, meansfor supplying fuel to the oat bowl, a valve for closing the air inlet ofthe carbureter, means fo'r holding the valve in open position, means formoving the valve to closed position and means 4for closing the air ventof the float bowl simultaneously with the closing of the air inlet ofthe carbureter arranged to leave the air vent fully open until the airinlet of the carbureter is fully closed. 3. In a fuel supply system foran internal combustion engine comprising a carbureter having an airinlet and a fuel inlet, a float bowl for supplying fuel to the /fuelinlet of the carbureter having a normally open air vent therein andotherwise closed against inlet of air, means for supplying fuel to thefioat bowl, a normally open valve for the air inlet of the carbureter,means for closing the valve and means operated by the valve closingmeans forvthe air inletof the carbureter closing the vent valve for thefloat bowl arranged to act upon the valve only on completion of theclosing of the valve of the air inlet. 4. In a fuel supply system for aninternal combustion engine comprising a carbureter having anair inletand a fuel inlet, a float bowl for supplying fuel to the fuel inlet forthe carbureter having a normally open air vent therein, means forsupplying fuel to the loat'bowl, a normally open valve for the air inletof the carbureter, a pivoted arm for closing the valve, a push rodhaving one end in the path of movement of the pivoted arm and carrying avalve at its other end for closing the air vent of the float bowl.

5. In a fuel supply system for an internal combustion engine comprisinga fuel mixing device having an air inlet and a fuel inlet, a iioat bowlfor supplying fuel to the fuel inlet of the fuel mixing device having anair vent therein, means for supplying fuel to the float bowl, a normallyopen valve for the air inlet of the fuel mixing device, a pivoted armfor closing the valve, a push rod having one end in the path of movement`,of the pivoted arm and carrying a valve at its other end for closingthe air vent of the float bowl and a spring normally holding the valveof the push'ro away from its seat.

6. In a fuel supplysystem for an internal combustion engine a fuelmixing device connected with the intake of the engine, having an airinlet and a fuel inlet, positively operating means for supplying fuel tothe fuel inlet and means for so reducing access of air to the fuelmixing device that the suction of the engine will draw fuel into themixing device during the priming operation.

7. In a fuel supply system for an lnternal combustion engine comprisinga fuel mixing n combustion engine a fuel mixing device having a fuellnlet and an air inlet, a fuel reservoir, a pipe leading from the fuelreservoir to said fuel inlet, a pump in saidy pipe and meansfor soreducing access of air to the mixing device that the suction of theengine will draw fuel from the fuel reservoir through the pump into themixing device during the priming operation to thereby prime the'mixingdevice and the pump.

8. In a fuel supply systemfor an internal device having an' air inletand a fuel inlet, a

. ioat bowlr for supplying fuel to thefuel inlet'lof the fuel mixingdevice having a normally open air vent .therein and otherwise' closedagainst inlet of air, meansvoperated by the engine for supplying fuel tothe fuel bowl, means for closing the air inlet of the fuel mixing deviceand means for closing the air vent of the float bowl.

9. In a fuel ,supply system for an internal combustion engine comprisinga fuel mixing device having an air inlet and'a fuel inlet, 4a

ioat bowl for supplying fuel to the fuel inlet of the fuel mixing devicehaving a normally open air vent`therein and otherwise closed againstinlet of air, means operated b ythel engine for supplyingfuel to theioat owl a valve 'for' closing the air inlet of the fuel rmxmg device,means for holding said valve in openposition, means for moving saidvalve to closed positionand meansfor closing the air vent of the floatbowl.

10. In a fuel supply system for'an internal combustion engine comprising-a fuelmixmg `device having an air inlet and a fuel inlet, a fioat bowlfor su plyin'g fuel to the fuel inlet of the fuel mixing device havin anormally open air vent therein' and ot erwise closed against .inlet ofair, means o erated by the 'engine for supplying fuel to t 'e floatbowl, a normally open valve for the air inlet of the fuelmixing device,means for closing said valve and means optated by the valve closingmeansfor the inlet of1 the fuel mixingdevice for' closing ,the air vent ofthe 'float bowl 11. In a fuel supply system for an internal combustionengine comprising a fuel mixing device having an air inlet and a fuelinlet, .a

Heat bowl for supplying fuelfto the fuel inlet of the fuel mixingdevicevhaving a normally open airvent therein, meansoperated b theengine for supplying fuel to lthe float owl, a normally open valve forthe air inlet of theA fuel mixing device, 4a pivoted arm for clos- `ing'the valve, a push rod .having one end in the path of movement of vsaidpivoted arm and carrying a valve at its other end forl closing the airvent of the oat bowl.l

12. Ina fuel supply system for int rnal combustion engines comprising acarbur ter having anl air inlet and a fuel inlet, al'float bowl forsupplying fuel lto the fuel inletof the` carburetery having a normallyopen vent therein, positively operating means for supplying fuel to thefuel bowl, and a single manual control means for closing the air inletof the carbureter and the air vent simultaneously. i

13. In a fuel supply system for internal combustionv engines comprisingan air inlet and a fuel inlet; a valve controlling the air inlet, aiioat'bowl for supplying fuel to thel carbureter having a-vent andotherwise closed against inlet of air and a valve controlling the vent,means for holding the air inlet valve normally in open position,independent means for holding the vent valve normally in open position,manually controlled means fr moving the air inlet valve towards closedposition and means operated by said means for moving the air inlet valvetowards closed position arranged to act upon the valvecontrolling thefuel bowl vent to force it to closed position. 14. In a fuel supplysystem for internal combustion 'engines comprising an air inlet' 1 andafuel Iinlet, a valve controlling the air inlet, means for moving thevvalve toward open position arranged to hold it normally in openposition, a' float bowl for supplying fuel to the carbureterhaving avent and otherwise closed against inlet of air and a valve controllingvthe vent, means for moving the valve Y'to position to open the ventAand a fuel inlet, a valve controlling the air inlet, means for movingthe valve-toward open position arranged to hold it normallyin openposition, a float bowl for supplying fuel to the vcarburete'r having avent and a valve controlling the vent, means for mov- 'ing theI valve toposition to openthe vent arranged/to hold' the vent normally open,maually controlled means for moving the air inlet valve towards closed'position and means inlet towards closed position arranged to act uponthe valve controllingI the fuel bowl vent to force ittoclosedpositionsimultaneously,

with the closing of the air inlet, the means v for closing the air inletvalve being arranged to have a limited movement in a direction to closethe airinlet without affecting the vent closin means. I

16. n a ful supply system for internal combustion. engines comprising anair 'inlet and a fuel inlet, a valve controlling the air inlet, meansfor moving the valve towards -operated by said means for. moving the airopen position arranged to hold it normally in open position, a floatbowl for supplying fuel to the carbureter having a vent and a valvecontrolling the vent, means for so move` ingT the valve as to open thevent arranged to hold the vent normally open, manually controlled meansfor moving the. air inlet valve towards closed position', and meansoperated by said means for moving the air inlet towards closed positionarranged as the air inlet valve reaches its closed position to act uponthe valve controlling the fuel bowl vent to force it to closed positionsimultaneously with the closing of the air inlet.

In testimony whereof, I hereunto aiix my signature. 1

LESTER P. iARLoW.

